Question

question 7 (2 points)
listen
what was the independent variable in your surface tension experiment?
soap
ice
water
penny

Explanation:

In a surface tension experiment, the independent variable is what's manipulated. Soap is added (manipulated) to see its effect on surface tension (dependent). Ice, water (control or dependent context), and penny (tool/control) aren't the manipulated factor here. So soap is the independent variable.

Answer:

A. soap